Hey kyote! Thank you!
For these I've been generally using 100% opacity brush that is just a flattened chalk brush, (standard photohshop)
I set the brush angle to "initial direction"
It's a new way of painting for me but I like the way the brush works so I'm trying to get used to it.

There are a few spots here an there where I use a standard chalk brush with pen controlled opacity but I'm trying to use that very little.
Hope that helps.
I'll add some details to my next posts too.
Thanks again!